/* 说明：背景图归属水印条 —— 左下角固定，低透明度，点击弹出详情弹窗。 */
.bg-attribution-bar {
  position: fixed;
  left: 1rem;
  bottom: 0.75rem;
  z-index: 25;
  max-width: min(28rem, calc(100vw - 5rem));
  padding: 0.3rem 0.6rem;
  /* 说明：水印表面复用 .app-glass；这里仅覆盖圆角与透明度。 */
  --app-glass-radius: var(--app-radius-inline);
  font-size: 0.7rem;
  line-height: 1.25;
  opacity: 0.4;
  cursor: pointer;
  color: var(--md-sys-color-on-surface);
  transition: opacity 0.25s ease, border-color 0.25s ease;
}

.bg-attribution-bar:hover,
.bg-attribution-bar:focus-visible {
  opacity: 0.9;
  text-decoration: underline;
  outline: none;
}

.bg-attribution-bar:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

.bg-attribution-bar__text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 说明：归属详情弹窗 —— 居中覆盖层，包含遮罩、面板与关闭按钮。 */
.bg-attribution-dialog {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  z-index: 265;
}

.bg-attribution-dialog.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.bg-attribution-dialog__backdrop {
  position: absolute;
  inset: 0;
}

.bg-attribution-dialog__panel {
  position: relative;
  min-width: min(28rem, 90vw);
  max-width: min(36rem, 94vw);
  padding: 1.5rem;
  /* 说明：弹窗面板表面复用 .app-glass/.app-card；这里仅覆盖圆角与阴影层级。 */
  --app-glass-radius: var(--app-radius-panel);
  --app-card-shadow: var(--md-sys-elevation-level4);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1.25rem;
}

.bg-attribution-dialog__content {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  flex: 1 1 auto;
  color: var(--md-sys-color-on-surface);
  font-size: var(--md-sys-typescale-body-medium-size);
  line-height: var(--md-sys-typescale-body-medium-line-height);
}

.bg-attribution-dialog__row {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.bg-attribution-dialog__label {
  font-weight: 600;
  font-size: var(--md-sys-typescale-label-large-size);
  line-height: var(--md-sys-typescale-label-large-line-height);
  color: var(--md-sys-color-on-surface-variant);
  flex-shrink: 0;
}

.bg-attribution-dialog__value {
  color: var(--app-text-accent-color);
  font-weight: 500;
  text-decoration: none;
}

.bg-attribution-dialog__value:hover,
.bg-attribution-dialog__value:focus-visible {
  text-decoration: underline;
}

.bg-attribution-dialog__value:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

.bg-attribution-dialog__close {
  margin-top: 0.25rem;
  align-self: center;
  --app-button-padding-block: 0.65rem;
  --app-button-padding-inline: 1.4rem;
}